Variability in chlorophyll α specific absorption coefficient in marine phytoplankton as a function of cell size and irradiance
Variability in chlorophyll α specific absorption coefficient in marine phytoplankton as a function of cell size and irradiance
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DOI：
10.1093/plankt/24.9.859
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发表时间：
2002-09-01
影响因子：
2.1
通讯作者：
Taguchi, S
中科院分区：
文献类型：
--
作者：
Fujiki, T;Taguchi, S
在25 ~ 750 μ mol·m ~（-2）·s ~（-1）范围内，对6种不同大小的浮游植物的叶绿素a（Chl_a）比吸收系数a ~*（λ）进行了定量测定。这些包括硅藻类海链藻、纤细角毛藻和圆筛藻，Chlorophyceae Dunaliella tertiolecta和Prymnesiophyceae Isochrysis galbana和Pleurochrysiscarterae。对于六个辐照度，细胞体积和a*（675）之间获得了统计学上显著的关系，在所有辐照度下，随着细胞体积的增加，a *（675）显著降低。然而，a*（440）显示细胞体积和a* 之间的统计学显著关系仅在25、40和90 μ mol m（-2）s（-1）时。几种色素的相对贡献估计使用基于色素的重建技术。在高辐照度下，光保护色素的吸收相对重要性增加。在强光条件下，由于光谱的蓝色区域中的光保护色素的吸收效应，在440 nm处的吸收的尺寸依赖性减弱。因此，所观察到的a* 的变化取决于海洋浮游植物的生理特性，本研究的结果表明，吸收的尺寸依赖性是低光条件下浮游植物的一个强大的特性。
Size-dependence of chlorophyll a (Chl a) specific absorption coefficient a*(lambda) for six irradiances ranging from 25 to 750 mumol m(-2) s(-1) was quantified for six species of phytoplankton Of varying size. These included Bacillariophyceae Thalassiosira weissflogii, Chaetoceros gracilis and Coscinodiscus sp., Chlorophyceae Dunaliella tertiolecta, and Prymnesiophyceae Isochrysis galbana and Pleurochrysis carterae. For the six irradiances, statistically significant relationships were obtained between cell volume and a*(675), which decreased significantly with increasing cell volume at all irradiances. However, a*(440) showed a statistically significant relationship between cell volume and a* at only 25, 40 and 90 mumol m(-2) s(-1). The relative contributions of several pigments were estimated using the pigment-based reconstruction technique. At high irradiance, absorption by photoprotective pigments increased in relative importance. Under high light conditions, size-dependence of absorption at 440 nm weakens due to the effects of absorption by photoprotective pigments in the blue region of the spectrum. Thus observed variability in a* is dependent on the physiological characteristics of marine phytoplankton, the result of this study indicates that size-dependence of absorption is a robust characteristic of phytoplankton under low light conditions.